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Detecting when text has run into the end of the ContainerController in a TextFlow object

This snippet shows how you can detect when a FlowElement that has been added to a TextFlow object (Text Layout Framework) has run to the end of the container that is flowing into. You may have linked containers that you are flowing a load of lorem ipsum into for a mock up and you want the containers to be full of text. You will need to detect when the text has reached the end otherwise the flow will continue but not be visible.